Improving aeration systems in saline water (part II): effect of different salts and diffuser type on oxygen transfer of fine-bubble aeration systems

The objective of the present study is to investigate the different effects on the oxygen transfer of fine-bubble aeration systems in saline water. Compared to tap water, oxygen transfer increases due to the inhibition of bubble coalescence. In Part I of the present study, we investigated in laborato...

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Autores principales: J. Behnisch, M. Schwarz, J. Trippel, M. Engelhart, M. Wagner
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Publicado: IWA Publishing 2021
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spelling oai:doaj.org-article:eace878519ca431980d74c157f5998df2021-11-06T11:07:49ZImproving aeration systems in saline water (part II): effect of different salts and diffuser type on oxygen transfer of fine-bubble aeration systems0273-12231996-973210.2166/wst.2021.185https://doaj.org/article/eace878519ca431980d74c157f5998df2021-06-01T00:00:00Zhttp://wst.iwaponline.com/content/83/11/2778https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732The objective of the present study is to investigate the different effects on the oxygen transfer of fine-bubble aeration systems in saline water. Compared to tap water, oxygen transfer increases due to the inhibition of bubble coalescence. In Part I of the present study, we investigated in laboratory-scale experiments the effect of design of diffuser membrane. The objective of Part II is the assessment of effects of different salts, diffuser type and diffuser density. We measured the concentration of various salts (MgCl2; CaCl2; Na2SO4; NaCl; KCl) above which coalescence is fully inhibited and oxygen transfer reaches its maximum (referred to as the critical coalescence concentration; CCC). For this purpose, we developed a new analytical approach, which enables investigation of the coalescence behaviour of any aeration system and (mixed) salt solution quickly and easily by evaluating the results of oxygen transfer tests. To investigate the transferability to large scale and the effect of diffuser type and density, we repeated lab-scale experiments in a 17,100 L pilot-scale test tank and carried out additional tests with tube and plate diffusers at different diffuser densities. The results show that despite the higher pressure drop, diffusers with dense slit density and smaller slits are to be recommended in order to improve efficiency of aeration systems in saline water. HIGHLIGHTS First time measurement of critical coalescence concentration (CCC) of various salts with fine bubble diffusers.; New analytical approach for measurement CCC.; Assessment of effects of different salts, diffuser type and diffuser density on oxygen transfer.; Additional design consideration for aeration in saline water.;J. BehnischM. SchwarzJ. TrippelM. EngelhartM. WagnerIWA Publishingarticlecritical coalescence concentrationflexible membrane diffusersaessotetransition concentrationEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 11, Pp 2778-2792 (2021)
institution DOAJ
collection DOAJ
language EN
topic critical coalescence concentration
flexible membrane diffuser
sae
ssote
transition concentration
Environmental technology. Sanitary engineering
TD1-1066
spellingShingle critical coalescence concentration
flexible membrane diffuser
sae
ssote
transition concentration
Environmental technology. Sanitary engineering
TD1-1066
J. Behnisch
M. Schwarz
J. Trippel
M. Engelhart
M. Wagner
Improving aeration systems in saline water (part II): effect of different salts and diffuser type on oxygen transfer of fine-bubble aeration systems
description The objective of the present study is to investigate the different effects on the oxygen transfer of fine-bubble aeration systems in saline water. Compared to tap water, oxygen transfer increases due to the inhibition of bubble coalescence. In Part I of the present study, we investigated in laboratory-scale experiments the effect of design of diffuser membrane. The objective of Part II is the assessment of effects of different salts, diffuser type and diffuser density. We measured the concentration of various salts (MgCl2; CaCl2; Na2SO4; NaCl; KCl) above which coalescence is fully inhibited and oxygen transfer reaches its maximum (referred to as the critical coalescence concentration; CCC). For this purpose, we developed a new analytical approach, which enables investigation of the coalescence behaviour of any aeration system and (mixed) salt solution quickly and easily by evaluating the results of oxygen transfer tests. To investigate the transferability to large scale and the effect of diffuser type and density, we repeated lab-scale experiments in a 17,100 L pilot-scale test tank and carried out additional tests with tube and plate diffusers at different diffuser densities. The results show that despite the higher pressure drop, diffusers with dense slit density and smaller slits are to be recommended in order to improve efficiency of aeration systems in saline water. HIGHLIGHTS First time measurement of critical coalescence concentration (CCC) of various salts with fine bubble diffusers.; New analytical approach for measurement CCC.; Assessment of effects of different salts, diffuser type and diffuser density on oxygen transfer.; Additional design consideration for aeration in saline water.;
format article
author J. Behnisch
M. Schwarz
J. Trippel
M. Engelhart
M. Wagner
author_facet J. Behnisch
M. Schwarz
J. Trippel
M. Engelhart
M. Wagner
author_sort J. Behnisch
title Improving aeration systems in saline water (part II): effect of different salts and diffuser type on oxygen transfer of fine-bubble aeration systems
title_short Improving aeration systems in saline water (part II): effect of different salts and diffuser type on oxygen transfer of fine-bubble aeration systems
title_full Improving aeration systems in saline water (part II): effect of different salts and diffuser type on oxygen transfer of fine-bubble aeration systems
title_fullStr Improving aeration systems in saline water (part II): effect of different salts and diffuser type on oxygen transfer of fine-bubble aeration systems
title_full_unstemmed Improving aeration systems in saline water (part II): effect of different salts and diffuser type on oxygen transfer of fine-bubble aeration systems
title_sort improving aeration systems in saline water (part ii): effect of different salts and diffuser type on oxygen transfer of fine-bubble aeration systems
publisher IWA Publishing
publishDate 2021
url https://doaj.org/article/eace878519ca431980d74c157f5998df
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AT mschwarz improvingaerationsystemsinsalinewaterpartiieffectofdifferentsaltsanddiffusertypeonoxygentransferoffinebubbleaerationsystems
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